Couple things come to mind.
1. fan clutch is one of the first things I replaced. Didn't fix my issue, but did help quite a bit. Very few aftermarket fans tend to cool as well as stock--and not just on these cars.
2. radiator cap can leak with age, and this can directly affect how well the coolant pressurizes. without pressure, coolant overheats. this is one of the 1st things to check.
3. scoops won't tend to cool very well. Scoops are designed for air induction for intakes--not to reduce bay temperatures. What you really want is airflow THROUGH the bay; ideally through the radiator & directly scavenged out of the bay. Vents are usually the best way to accomplish this--if stock cooling proves insufficient.
4. Color matters. Dollars to doughnuts even if you already have a white VX, painting your insert white will probably drop bay temps by 5+ degrees on a hot day--even with constant airflow through the bay. There's a reason Bluebird paints the tops of all their buses white--and have done so for ~20 years.
5. Test your coolant. Not for temperature effectiveness--you can use 50/50 prestone & forget about it. I'm talking about particulates & metals. I had 2 different shops test it; same result--carbons. Meaning that my head gasket was fried. Not a cheap fix--but it's been well over a year, and not 1 issue--including driving it 2100 miles across country (600+ per day at times). And now in GA heat/humidity, temp needle doesn't budge after it's warmed up--and that's with the A/C on full blast.
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